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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] [PATCH] CPPFLAGS+= in Makefile.target
Date: Fri, 25 Jan 2008 15:36:57 +0000
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To: qemu-devel@nongnu.org
Cc: Ian Jackson <Ian.Jackson@eu.citrix.com>

> What I mean is: if you want
> for any reason to build qemu in a weird way then you're going to have
> to edit config-host.mak (or somewhere similar) in any case.  You
> probably want to set some CPPFLAGS as well as various other things.
> If you do this at the moment then you have to reproduce all of the
> CPPFLAGS -I settings and so on from Makefile.target in your own
> setting that you add to config-host.mak.

In that case you should always provide a definition in config-host.mak.
Under some circumstances make may inherit initial values from elsewhere.
The rules for make variables are sufficiently twisty that it's best to be 
explicit, rather than allowing a subset of the ways of defining that 
variable.


Paul